Statistics Homework Answers & Questions Page 268

• For a normal distribution, mean u=8. Find standard deviation if r is the variable P(6<r<10)=0.5 ?

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• What is the difference between the line of best fit and the least squares regression line?

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• 14% compounded continuously

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• In how many ways can 4 people be seated in a row of 12 chairs?

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• What does discrete mean?

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• What is the difference between a chi square test of independence and a chi square test for homogeneity?

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• Why is a 90% confidence interval narrower than a 95% confidence interval?

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• How do you find the z-score for which 95% of the distribution's area lies between -z and z?

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• How do you find the experimental probability of a compound event?

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• What is the meaning of a double blind experiment?

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• Is a bell curve symmetric, right-skewed, or left-skewed?

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• Permutation and combination? In your own words, explain the difference between a permutation and a combination. Also, give an example of a problem whose solution is a permutation and an example of a problem whose solution is a combination.?

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• A coin is flipped 12 times. What is the probability of getting exactly 8 heads?

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• What are independent trials, and how do they relate to the definition of probability?

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• How do you find the cumulative relative frequency?

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• How do you find the central angle of a pie chart for a section of the pie chart that represents 20% of the pie?

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• What is a voluntary response sample?

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• What is a z score in regard to relative position?

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• Suppose that X is a discrete random variable with probability mass function p(x) = cx^2; x = 1; 2; 3; 4: (a) Find the value of c: (b) Find E(X)?

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• What are "p hat" and "p"?

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• What is a uniform density curve?

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• How do you calculate sample mean?

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• How do you calculate critical value chi squared?

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• How do you find the mean, median, mode and range of 30, 34, 35, 39, 33, 32, 31, 36, 35, 37?

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• If a person scores in the 45th percentile on the ACT, how do we interpret this?

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• What does a negative correlation coefficient mean about a scatter plot of the data?

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• A card is drawn from a standard deck of 52 playing cards. What is the probability that the card is an ace or a king?

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• What is the average deviation of ##1.76, 2.28, 1.90##?

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• What is the formula for calculating the test statistic for a one-sample z test?

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• A sock drawer has 8 blue socks and 6 black socks. If I randomly select two socks, one at a time, what is the probability l will first get a blue sock and then, without replacing it, a black sock?

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• Is the fuel efficiency (in miles per gallon) of an automobile a discrete or continuous variable?

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• How does an outlier affect the value of the standard deviation?

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• In regression analysis, what does the F-value mean?

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• What is the difference between the Pearson correlation coefficient and the Spearman correlation?

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• What is the median number for the numbers 4, 8, 10, 5, 9?

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• Blood types A, B, O, and AB have percentages 40%, 20%, 30% and 10%. If two individuals are chosen at random, assuming independence, how do you find probability that neither is of blood type A?

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• What are class boundaries in statistics?

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• How many different ways can you choose 3 vowels out of the box, if there are 5 vowels in the box and order does not matter?

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• What is the importance of a histogram?

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• Is temperature a discrete or continuous variable?

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• If we remove all of the queens from a 52-card deck, how many unique four card combinations can we have?

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• A bowl of fruit is on the table. It contains six apples, two oranges, and four bananas. Daniel and Sean come home from school and randomly grab one fruit each. What is the probability that both grab oranges?

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• Is the difference between an OLS regression and a GLS regression qualitative or quantitative?

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• How does r squared related to standard deviation?

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• What is the mode for the sample 3, 2, 5, 7, 3, 2, 6, 4, 3, 7, 2, 4, 3, 5, 7, 5, 1, 2, 5, 3,7 ?

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• What is the average of 10, 18, and 23?

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• At a restaurant, you can choose from 2 appetizers, 4 main courses, and 3 desserts. How many different meals, each consisting of one appetizer, one main course, and one dessert, can be created?

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• How is the confidence interval formula for the slope similar to other confidence intervals that we have calculated?

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• A jewelry box contains two gold hoop earrings and two silver hoop earrings. You randomly choose two earrings. What is the probability that both are silver hoop earrings?

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• How do you find the z-score for sample mean M = 90 for a sample of n = 4?

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